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$B^-\\to f_0(980)\\rho^-, K^{*0}_0(1430)\\rho^-, K^{*-}_0(1430)\\rho^0(\\omega)$ are studied by employing the perturbative QCD (PQCD)factorization approach. we find the following results: (a) if the scalar meson $f_0(980)$ is viewed as a mixture of $s\\bar s$ and $(u\\bar u+d\\bar d)/\\sqrt{2}$, the branching ratios of the decays $\\bar{B}^0\\to 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